Currently, the role of digital technologies has grown significantly, which also demonstrated the importance of digital transformation, especially for developing countries, including Uzbekistan. Digital transformation has the potential to further modernize society and integrate national economies into global processes. In this context, within the framework of the ongoing reforms, as well as the Development Strategy of the New Uzbekistan for the next five years, special attention is paid to the development of information and communication technologies, such as: 5G, Wi-Fi, digital television, Zigbee, the Internet of things. In order to master modern technologies, as well as to ensure interference-free operation of all users of the radio frequency spectrum, it is necessary to constantly improve the knowledge, skills and professional qualifications of specialists.
To improve the quality of services provided to ensure electromagnetic compatibility of radio relay lines and to transport information flows, the State Unitary Enterprise “Center for Electromagnetic Compatibility” uses the following software: Spectra EMS, Rakurs, Chir Plus and Mentum Ellipse. The specialists of the Fixed and Satellite Communications Department rely on proven engineering solutions, calculation algorithms and the latest recommendations of the International Telecommunication Union to calculate the electromagnetic compatibility of fixed broadband point-to-point and point-to-multipoint networks.
When calculating electromagnetic compatibility for line-of-sight radio relay lines, the following ITU-R recommendations are taken into account:
1. P.452-14 - Prediction procedure for estimating interference between stations on the Earth's surface at frequencies above approximately 0.1 GHz;
2. P.530 - Propagation data and prediction methods required for the design of terrestrial line-of-sight systems;
3. P.2001-1 - General-purpose terrestrial propagation model for general use in the 30 MHz to 50 GHz band.
Recommendations used in calculating the EMC of the RRL
Software with built-in digital geographic map with earth surface topology and heights allows:
1. calculate electromagnetic compatibility for individual spans or their groups;
2. check for interference in the entire RRL network or in part of it;
3. display graphical results of interference analysis;
4. automatically assign frequency channels based on interference analysis;
5. reduce the number of frequency channels used in the network, while simultaneously ensuring high quality and reliability of data transmission.
An example of taking into account the relief and curvature of the earth
Пример анализа РРЛ
Example of EMC calculation
Antenna radiation pattern
Using these programs, employees of the fixed and satellite communications department calculate the electromagnetic compatibility of existing and planned radio relay lines in the ranges of 6, 7, 8, 10, 11, 13, 15, 18, 23, 26, 28, 32, 38, 42, 71-76/81-86 GHz. Provide assistance to mobile operators in planning radio frequencies on transport sections between cellular base stations. Also, the use of these programs in production activities allows for high-quality and prompt solutions to problems related to ensuring EMC.
Engineer 1st category FSSD
Tajimatov R.M.
